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Vertical lengths ..... residential HVAC unit..

went out to look at a AC unit this fall .... customer is complaining that the AH runs continuously during the summer and get minimal cooling. Have check the coils on the AH, pressures on the compressor .... they were a little low but not too bad.... it is a 2tn unit but the vertical rise on the line set is at least 25 ft with 2 horizontal runs of 10 ft each. 2 tns is adequate for the cubic footage but I am trying to find some data as to whether or not these vertical runs are too excessive and some sizing adjustments.

The customer wants it fixed .... I am considering a Fujitsu split system I can mount on his back roof with two inside units.

The overall length of 45 ft is why I was thinking increase dia. But there maybe other issues like airflow or dirty coil that are not readily apparent on a msg board. Check with the manufacturers specifications for long linesets, that will tell you exactly what size lineset you need as well if you need an oil trap or something like that.